The evolved form of "psh." It went from "psh" to "psha" to "pshaw" then the the ultimate form, fpshaw! Use as an exclaimation of something awesome or as emphasis of doubt.

Official Sign of Fpshaw: Extend the middle finger and the ring finger on either the right or left hand. Hold fingers under the nose and make the motion like "beyaw", just say "fpshaw."
Fpshaw, thats so not how you do it.
Fpshaw! Dude, that car just blew up!
by #1 Big Bootay June 7, 2007
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